> Eh, perhaps we can’t detect it perfectly reliably, but we can absolutely detect it. Go to a funeral and observe a widow in anguish.

If your definition of suffering describes both the widow grieving a lost husband and a shrimp slowly going whatever the equivalent is of unconscious in an icewater bath... it doesn't much seem to be a useful word.

> Just because we haven’t (yet) built a machine to

Yes, because we haven't built the machine, we can't much tell if the widow is in "anguish" or is putting on a show for the public. Some widows are living their most joyous days, but they can't always show it.